r/techsupport Jan 20 '22

Certificate issue on Windows 10 pc Open | Networking

On both edge and chrome no matter what site I go to I get this error:

  • Your connection is not private.
  • NET::ERR_CERT_COMMON_NAME_INVALID

While on Firefox I can access google and youtube, facebook but if I click further I get an error:

  • Secure connection failed
  • PR_CONNECT_RESET_ERROR

My PC is running Windows 10 21H1 19043.1288

  • I tried disabling my AV and firewall without success.
  • There were some time difference, so I installed NetTime so the time and is now correct, but I am still running into the same problem.
  • clearing SSL state does nothing.

Running Windows update doesn't work, and I can't roll back Windows update because it has been longer than 10 days.

Thanks in advance

Any help is greatly appreciated.

Edit:

Solution

I decided to uninstall my antivirus completely. (even though disabling it earlier hadn't shown any change).

As a result, the error changed now. Now, the error was about a proxy server not connecting.

I checked the pc proxy settings. It turns out the manual proxy setup had been enabled. But I don't remember having enabled the setting.

I do remember being able to update my antivirus before noticing I couldn't get online.

Thanks everyone for the help.

2 Upvotes

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1

u/PM_ME_YOUR-WAIFU Jan 20 '22

Click on the "Not secure" button in Chrome, then "Certificate is not valid". Post the screenshot of the resulting window.

1

u/MediocreGood Jan 20 '22

https://imgur.com/a/Fy5D0Zl

Here is a screenshot

1

u/PM_ME_YOUR-WAIFU Jan 20 '22

As GeoTrust has never issued this certificate and has been untrusted for some time, I'd guess that you have something on your network trying to MITM your connection. Are you using your home connection? If so, do you have work VPN enabled?

1

u/MediocreGood Jan 20 '22

No there is no vpn. The pc is at work.

1

u/PM_ME_YOUR-WAIFU Jan 20 '22

Do you have a firewall appliance on your network? Ask/check if it's doing ssl inspection. A lot of companies decrypt their employees traffic to check for threats.

1

u/mytruth2017 Jan 20 '22

windows Time and date? is it setn accurate

1

u/MediocreGood Jan 20 '22

The date was correct, but time was off by 2 minutes or so

1

u/mytruth2017 Jan 20 '22

well thats the solution then.

1

u/MediocreGood Jan 20 '22

Well I installed nettime and the time is now correct but the error still remains.